Various separation techniques such as normal and adverse silica gel and Sephadex LH-20 gel column chramatography were used to investigate the chemical constituents from the leaves of Syzygium brachyantherum.In result,ten compounds,including 3β,23-O-isopropylidenyl-2a,19a-dihydroxy-urs-12-en-28-oic acid(1),hyptaic acid B(2),corosolic acid(3),friedelin(4),friedelan-3β-ol(5),3β-hydroxy-5-glutinene(6),daucosterol(7),(7R,8S)-3,5'-dimethoxy-4',7-epoxy-8,3'-neolignane-5,9,9'-triol(8),methyl gallate(9)and β-selinene(10)were isolated and determined and their structures were identified by NMR spectroscopic data and comparison with values reported.Among them,compound 1 was a new ketal produced by 2 and acetone during isolation.All compounds were isolated from S.brachyantherumfor the first time.
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